It looks like you didn't include any communication transcripts (texts, WhatsApp, etc). It's secondary but it helps.
For example, in our petition, we included approx. 12 pages of texts (6 from him, 6 from me) just showing our conversations - none of it even pertained to marriage or plans, just clearly showing that we were in regular consistent communication and talked about all manner of things (food, planned trips, going about our days, etc).
We also included a 2 page document that explained how we met (online), when we first met in person and how we both wanted to be together in the US.
All in all, our file was 50+ pages.